+package org.simantics.scl.compiler.elaboration.expressions;\r
+\r
+import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;\r
+import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
+import org.simantics.scl.compiler.elaboration.contexts.TypingContext;\r
+import org.simantics.scl.compiler.environment.Environment;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+import org.simantics.scl.compiler.internal.codegen.references.IVal;\r
+import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;\r
+import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+import org.simantics.scl.compiler.types.exceptions.MatchException;\r
+import org.simantics.scl.compiler.types.util.MultiFunction;\r
+\r
+import gnu.trove.map.hash.TObjectIntHashMap;\r
+import gnu.trove.set.hash.THashSet;\r
+import gnu.trove.set.hash.TIntHashSet;\r
+\r
+public class EViewPattern extends Expression {\r
+ public Expression expression;\r
+ public Expression pattern;\r
+ \r
+ public EViewPattern(Expression expression, Expression pattern) {\r
+ this.expression = expression;\r
+ this.pattern = pattern;\r
+ }\r
+\r
+ @Override\r
+ public void collectRefs(TObjectIntHashMap<Object> allRefs, TIntHashSet refs) {\r
+ expression.collectRefs(allRefs, refs);\r
+ pattern.collectRefs(allRefs, refs);\r
+ }\r
+\r
+ @Override\r
+ public void collectVars(TObjectIntHashMap<Variable> allVars, TIntHashSet vars) {\r
+ expression.collectVars(allVars, vars);\r
+ pattern.collectVars(allVars, vars);\r
+ }\r
+\r
+ @Override\r
+ public void forVariables(VariableProcedure procedure) {\r
+ expression.forVariables(procedure);\r
+ pattern.forVariables(procedure);\r
+ }\r
+ \r
+ @Override\r
+ public Expression inferType(TypingContext context) {\r
+ context.setInPattern(false);\r
+ expression = expression.inferType(context);\r
+ context.setInPattern(true);\r
+ MultiFunction mfun;\r
+ try {\r
+ mfun = Types.matchFunction(expression.getType(), 1);\r
+ } catch (MatchException e) {\r
+ context.getErrorLog().log(expression.location, "Expected a function as a transformation expression.");\r
+ return new EError(location);\r
+ }\r
+ setType(mfun.parameterTypes[0]);\r
+ pattern.checkType(context, mfun.returnType);\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ protected void updateType() throws MatchException {\r
+ MultiFunction mfun = Types.matchFunction(expression.getType(), 1);\r
+ setType(mfun.parameterTypes[0]);\r
+ }\r
+\r
+ @Override\r
+ public IVal toVal(Environment env, CodeWriter w) {\r
+ throw new InternalCompilerError(location, "EViewPattern.toVal should not be invoked.");\r
+ }\r
+\r
+ @Override\r
+ public void collectFreeVariables(THashSet<Variable> vars) {\r
+ throw new InternalCompilerError(location, "Cannot collect free variables for a pattern.");\r
+ }\r
+ \r
+ @Override\r
+ public void removeFreeVariables(THashSet<Variable> vars) {\r
+ expression.collectFreeVariables(vars);\r
+ pattern.removeFreeVariables(vars);\r
+ }\r
+\r
+ @Override\r
+ public Expression resolve(TranslationContext context) {\r
+ context.getErrorLog().log("View pattern cannot occur only in patterns. Maybe you are missing '\\' in front of a lambda experssion?");\r
+ return new EError(location);\r
+ }\r
+\r
+ @Override\r
+ public Expression resolveAsPattern(TranslationContext context) {\r
+ expression = expression.resolve(context);\r
+ pattern = pattern.resolveAsPattern(context);\r
+ return this;\r
+ }\r
+ \r
+ @Override\r
+ public void setLocationDeep(long loc) {\r
+ if(location == Locations.NO_LOCATION) {\r
+ location = loc; \r
+ expression.setLocationDeep(loc);\r
+ pattern.setLocationDeep(loc);\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public Expression decorate(ExpressionDecorator decorator) {\r
+ expression = expression.decorate(decorator);\r
+ return this;\r
+ }\r
+\r
+ @Override\r
+ public void collectEffects(THashSet<Type> effects) {\r
+ expression.collectEffects(effects);\r
+ }\r
+\r
+ @Override\r
+ public void accept(ExpressionVisitor visitor) {\r
+ visitor.visit(this);\r
+ }\r
+\r
+ @Override\r
+ public Expression accept(ExpressionTransformer transformer) {\r
+ return transformer.transform(this);\r
+ }\r
+ \r
+ @Override\r
+ public Expression simplify(SimplificationContext context) {\r
+ expression = expression.simplify(context);\r
+ pattern = pattern.simplify(context);\r
+ return this;\r
+ }\r
+\r
+}\r